5e2ecf4178
# Objective Add background colors for text. Fixes #18889 ## Solution New component `TextBackgroundColor`, add it to any UI `Text` or `TextSpan` entity to add a background color to its text. New field on `TextLayoutInfo` `section_rects` holds the list of bounding rects for each text section. The bounding rects are generated in `TextPipeline::queue_text` during text layout, `extract_text_background_colors` extracts the colored background rects for rendering. Didn't include `Text2d` support because of z-order issues. The section rects can also be used to implement interactions targeting individual text sections. ## Testing Includes a basic example that can be used for testing: ``` cargo run --example text_background_colors ``` --- ## Showcase  Using a proportional font with kerning the results aren't so tidy (since the bounds of adjacent glyphs can overlap) but it still works fine:  --------- Co-authored-by: Olle Lukowski <lukowskiolle@gmail.com> Co-authored-by: Gilles Henaux <ghx_github_priv@fastmail.com>
586 lines
21 KiB
Rust
586 lines
21 KiB
Rust
pub use cosmic_text::{
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self, FamilyOwned as FontFamily, Stretch as FontStretch, Style as FontStyle,
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Weight as FontWeight,
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};
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use crate::{Font, TextLayoutInfo, TextSpanAccess, TextSpanComponent};
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use bevy_asset::Handle;
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use bevy_color::Color;
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use bevy_derive::{Deref, DerefMut};
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use bevy_ecs::{prelude::*, reflect::ReflectComponent};
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use bevy_reflect::prelude::*;
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use bevy_utils::once;
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use cosmic_text::{Buffer, Metrics};
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use serde::{Deserialize, Serialize};
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use smallvec::SmallVec;
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use tracing::warn;
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/// Wrapper for [`cosmic_text::Buffer`]
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#[derive(Deref, DerefMut, Debug, Clone)]
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pub struct CosmicBuffer(pub Buffer);
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impl Default for CosmicBuffer {
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fn default() -> Self {
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Self(Buffer::new_empty(Metrics::new(0.0, 0.000001)))
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}
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}
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/// A sub-entity of a [`ComputedTextBlock`].
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///
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/// Returned by [`ComputedTextBlock::entities`].
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#[derive(Debug, Copy, Clone, Reflect)]
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#[reflect(Debug, Clone)]
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pub struct TextEntity {
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/// The entity.
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pub entity: Entity,
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/// Records the hierarchy depth of the entity within a `TextLayout`.
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pub depth: usize,
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}
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/// Computed information for a text block.
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///
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/// See [`TextLayout`].
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///
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/// Automatically updated by 2d and UI text systems.
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#[derive(Component, Debug, Clone, Reflect)]
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#[reflect(Component, Debug, Default, Clone)]
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pub struct ComputedTextBlock {
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/// Buffer for managing text layout and creating [`TextLayoutInfo`].
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///
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/// This is private because buffer contents are always refreshed from ECS state when writing glyphs to
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/// `TextLayoutInfo`. If you want to control the buffer contents manually or use the `cosmic-text`
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/// editor, then you need to not use `TextLayout` and instead manually implement the conversion to
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/// `TextLayoutInfo`.
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#[reflect(ignore, clone)]
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pub(crate) buffer: CosmicBuffer,
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/// Entities for all text spans in the block, including the root-level text.
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///
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/// The [`TextEntity::depth`] field can be used to reconstruct the hierarchy.
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pub(crate) entities: SmallVec<[TextEntity; 1]>,
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/// Flag set when any change has been made to this block that should cause it to be rerendered.
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///
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/// Includes:
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/// - [`TextLayout`] changes.
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/// - [`TextFont`] or `Text2d`/`Text`/`TextSpan` changes anywhere in the block's entity hierarchy.
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// TODO: This encompasses both structural changes like font size or justification and non-structural
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// changes like text color and font smoothing. This field currently causes UI to 'remeasure' text, even if
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// the actual changes are non-structural and can be handled by only rerendering and not remeasuring. A full
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// solution would probably require splitting TextLayout and TextFont into structural/non-structural
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// components for more granular change detection. A cost/benefit analysis is needed.
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pub(crate) needs_rerender: bool,
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}
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impl ComputedTextBlock {
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/// Accesses entities in this block.
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///
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/// Can be used to look up [`TextFont`] components for glyphs in [`TextLayoutInfo`] using the `span_index`
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/// stored there.
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pub fn entities(&self) -> &[TextEntity] {
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&self.entities
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}
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/// Indicates if the text needs to be refreshed in [`TextLayoutInfo`].
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///
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/// Updated automatically by [`detect_text_needs_rerender`] and cleared
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/// by [`TextPipeline`](crate::TextPipeline) methods.
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pub fn needs_rerender(&self) -> bool {
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self.needs_rerender
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}
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/// Accesses the underlying buffer which can be used for `cosmic-text` APIs such as accessing layout information
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/// or calculating a cursor position.
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///
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/// Mutable access is not offered because changes would be overwritten during the automated layout calculation.
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/// If you want to control the buffer contents manually or use the `cosmic-text`
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/// editor, then you need to not use `TextLayout` and instead manually implement the conversion to
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/// `TextLayoutInfo`.
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pub fn buffer(&self) -> &CosmicBuffer {
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&self.buffer
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}
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}
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impl Default for ComputedTextBlock {
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fn default() -> Self {
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Self {
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buffer: CosmicBuffer::default(),
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entities: SmallVec::default(),
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needs_rerender: true,
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}
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}
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}
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/// Component with text format settings for a block of text.
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///
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/// A block of text is composed of text spans, which each have a separate string value and [`TextFont`]. Text
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/// spans associated with a text block are collected into [`ComputedTextBlock`] for layout, and then inserted
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/// to [`TextLayoutInfo`] for rendering.
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///
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/// See [`Text2d`](crate::Text2d) for the core component of 2d text, and `Text` in `bevy_ui` for UI text.
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#[derive(Component, Debug, Copy, Clone, Default, Reflect)]
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#[reflect(Component, Default, Debug, Clone)]
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#[require(ComputedTextBlock, TextLayoutInfo)]
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pub struct TextLayout {
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/// The text's internal alignment.
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/// Should not affect its position within a container.
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pub justify: JustifyText,
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/// How the text should linebreak when running out of the bounds determined by `max_size`.
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pub linebreak: LineBreak,
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}
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impl TextLayout {
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/// Makes a new [`TextLayout`].
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pub const fn new(justify: JustifyText, linebreak: LineBreak) -> Self {
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Self { justify, linebreak }
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}
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/// Makes a new [`TextLayout`] with the specified [`JustifyText`].
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pub fn new_with_justify(justify: JustifyText) -> Self {
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Self::default().with_justify(justify)
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}
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/// Makes a new [`TextLayout`] with the specified [`LineBreak`].
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pub fn new_with_linebreak(linebreak: LineBreak) -> Self {
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Self::default().with_linebreak(linebreak)
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}
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/// Makes a new [`TextLayout`] with soft wrapping disabled.
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/// Hard wrapping, where text contains an explicit linebreak such as the escape sequence `\n`, will still occur.
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pub fn new_with_no_wrap() -> Self {
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Self::default().with_no_wrap()
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}
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/// Returns this [`TextLayout`] with the specified [`JustifyText`].
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pub const fn with_justify(mut self, justify: JustifyText) -> Self {
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self.justify = justify;
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self
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}
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/// Returns this [`TextLayout`] with the specified [`LineBreak`].
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pub const fn with_linebreak(mut self, linebreak: LineBreak) -> Self {
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self.linebreak = linebreak;
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self
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}
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/// Returns this [`TextLayout`] with soft wrapping disabled.
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/// Hard wrapping, where text contains an explicit linebreak such as the escape sequence `\n`, will still occur.
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pub const fn with_no_wrap(mut self) -> Self {
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self.linebreak = LineBreak::NoWrap;
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self
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}
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}
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/// A span of text in a tree of spans.
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///
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/// `TextSpan` is only valid as a child of an entity with [`TextLayout`], which is provided by `Text`
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/// for text in `bevy_ui` or `Text2d` for text in 2d world-space.
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///
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/// Spans are collected in hierarchy traversal order into a [`ComputedTextBlock`] for layout.
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///
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/// ```
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/// # use bevy_asset::Handle;
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/// # use bevy_color::Color;
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/// # use bevy_color::palettes::basic::{RED, BLUE};
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/// # use bevy_ecs::world::World;
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/// # use bevy_text::{Font, TextLayout, TextFont, TextSpan, TextColor};
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///
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/// # let font_handle: Handle<Font> = Default::default();
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/// # let mut world = World::default();
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/// #
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/// world.spawn((
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/// // `Text` or `Text2d` are needed, and will provide default instances
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/// // of the following components.
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/// TextLayout::default(),
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/// TextFont {
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/// font: font_handle.clone().into(),
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/// font_size: 60.0,
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/// ..Default::default()
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/// },
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/// TextColor(BLUE.into()),
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/// ))
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/// .with_child((
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/// // Children must be `TextSpan`, not `Text` or `Text2d`.
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/// TextSpan::new("Hello!"),
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/// TextFont {
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/// font: font_handle.into(),
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/// font_size: 60.0,
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/// ..Default::default()
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/// },
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/// TextColor(RED.into()),
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/// ));
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/// ```
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#[derive(Component, Debug, Default, Clone, Deref, DerefMut, Reflect)]
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#[reflect(Component, Default, Debug, Clone)]
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#[require(TextFont, TextColor)]
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pub struct TextSpan(pub String);
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impl TextSpan {
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/// Makes a new text span component.
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pub fn new(text: impl Into<String>) -> Self {
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Self(text.into())
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}
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}
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impl TextSpanComponent for TextSpan {}
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impl TextSpanAccess for TextSpan {
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fn read_span(&self) -> &str {
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self.as_str()
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}
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fn write_span(&mut self) -> &mut String {
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&mut *self
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}
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}
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impl From<&str> for TextSpan {
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fn from(value: &str) -> Self {
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Self(String::from(value))
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}
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}
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impl From<String> for TextSpan {
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fn from(value: String) -> Self {
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Self(value)
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}
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}
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/// Describes the horizontal alignment of multiple lines of text relative to each other.
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///
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/// This only affects the internal positioning of the lines of text within a text entity and
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/// does not affect the text entity's position.
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///
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/// _Has no affect on a single line text entity_, unless used together with a
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/// [`TextBounds`](super::bounds::TextBounds) component with an explicit `width` value.
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#[derive(Debug, Default, Clone, Copy, PartialEq, Eq, Hash, Reflect, Serialize, Deserialize)]
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#[reflect(Serialize, Deserialize, Clone, PartialEq, Hash)]
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pub enum JustifyText {
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/// Leftmost character is immediately to the right of the render position.
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/// Bounds start from the render position and advance rightwards.
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#[default]
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Left,
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/// Leftmost & rightmost characters are equidistant to the render position.
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/// Bounds start from the render position and advance equally left & right.
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Center,
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/// Rightmost character is immediately to the left of the render position.
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/// Bounds start from the render position and advance leftwards.
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Right,
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/// Words are spaced so that leftmost & rightmost characters
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/// align with their margins.
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/// Bounds start from the render position and advance equally left & right.
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Justified,
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}
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impl From<JustifyText> for cosmic_text::Align {
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fn from(justify: JustifyText) -> Self {
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match justify {
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JustifyText::Left => cosmic_text::Align::Left,
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JustifyText::Center => cosmic_text::Align::Center,
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JustifyText::Right => cosmic_text::Align::Right,
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JustifyText::Justified => cosmic_text::Align::Justified,
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}
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}
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}
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/// `TextFont` determines the style of a text span within a [`ComputedTextBlock`], specifically
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/// the font face, the font size, and the color.
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#[derive(Component, Clone, Debug, Reflect)]
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#[reflect(Component, Default, Debug, Clone)]
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pub struct TextFont {
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/// The specific font face to use, as a `Handle` to a [`Font`] asset.
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///
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/// If the `font` is not specified, then
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/// * if `default_font` feature is enabled (enabled by default in `bevy` crate),
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/// `FiraMono-subset.ttf` compiled into the library is used.
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/// * otherwise no text will be rendered, unless a custom font is loaded into the default font
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/// handle.
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pub font: Handle<Font>,
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/// The vertical height of rasterized glyphs in the font atlas in pixels.
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///
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/// This is multiplied by the window scale factor and `UiScale`, but not the text entity
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/// transform or camera projection.
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///
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/// A new font atlas is generated for every combination of font handle and scaled font size
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/// which can have a strong performance impact.
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pub font_size: f32,
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/// The vertical height of a line of text, from the top of one line to the top of the
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/// next.
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///
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/// Defaults to `LineHeight::RelativeToFont(1.2)`
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pub line_height: LineHeight,
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/// The antialiasing method to use when rendering text.
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pub font_smoothing: FontSmoothing,
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}
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impl TextFont {
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/// Returns a new [`TextFont`] with the specified font face handle.
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pub fn from_font(font: Handle<Font>) -> Self {
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Self::default().with_font(font)
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}
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/// Returns a new [`TextFont`] with the specified font size.
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pub fn from_font_size(font_size: f32) -> Self {
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Self::default().with_font_size(font_size)
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}
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/// Returns this [`TextFont`] with the specified font face handle.
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pub fn with_font(mut self, font: Handle<Font>) -> Self {
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self.font = font;
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self
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}
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/// Returns this [`TextFont`] with the specified font size.
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pub const fn with_font_size(mut self, font_size: f32) -> Self {
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self.font_size = font_size;
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self
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}
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/// Returns this [`TextFont`] with the specified [`FontSmoothing`].
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pub const fn with_font_smoothing(mut self, font_smoothing: FontSmoothing) -> Self {
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self.font_smoothing = font_smoothing;
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self
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}
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/// Returns this [`TextFont`] with the specified [`LineHeight`].
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pub const fn with_line_height(mut self, line_height: LineHeight) -> Self {
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self.line_height = line_height;
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self
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}
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}
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impl Default for TextFont {
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fn default() -> Self {
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Self {
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font: Default::default(),
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font_size: 20.0,
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line_height: LineHeight::default(),
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font_smoothing: Default::default(),
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}
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}
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}
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/// Specifies the height of each line of text for `Text` and `Text2d`
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///
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/// Default is 1.2x the font size
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#[derive(Debug, Clone, Copy, Reflect)]
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#[reflect(Debug, Clone)]
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pub enum LineHeight {
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/// Set line height to a specific number of pixels
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Px(f32),
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/// Set line height to a multiple of the font size
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RelativeToFont(f32),
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}
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impl LineHeight {
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pub(crate) fn eval(self, font_size: f32) -> f32 {
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match self {
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LineHeight::Px(px) => px,
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LineHeight::RelativeToFont(scale) => scale * font_size,
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}
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}
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}
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impl Default for LineHeight {
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fn default() -> Self {
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LineHeight::RelativeToFont(1.2)
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}
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}
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/// The color of the text for this section.
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#[derive(Component, Copy, Clone, Debug, Deref, DerefMut, Reflect, PartialEq)]
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#[reflect(Component, Default, Debug, PartialEq, Clone)]
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pub struct TextColor(pub Color);
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impl Default for TextColor {
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fn default() -> Self {
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Self::WHITE
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}
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}
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impl<T: Into<Color>> From<T> for TextColor {
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fn from(color: T) -> Self {
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Self(color.into())
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}
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}
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impl TextColor {
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/// Black colored text
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pub const BLACK: Self = TextColor(Color::BLACK);
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/// White colored text
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pub const WHITE: Self = TextColor(Color::WHITE);
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}
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/// The background color of the text for this section.
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#[derive(Component, Copy, Clone, Debug, Deref, DerefMut, Reflect, PartialEq)]
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#[reflect(Component, Default, Debug, PartialEq, Clone)]
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pub struct TextBackgroundColor(pub Color);
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impl Default for TextBackgroundColor {
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fn default() -> Self {
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Self(Color::BLACK)
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}
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}
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impl<T: Into<Color>> From<T> for TextBackgroundColor {
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fn from(color: T) -> Self {
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Self(color.into())
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}
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}
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impl TextBackgroundColor {
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/// Black background
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pub const BLACK: Self = TextBackgroundColor(Color::BLACK);
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/// White background
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pub const WHITE: Self = TextBackgroundColor(Color::WHITE);
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}
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/// Determines how lines will be broken when preventing text from running out of bounds.
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default, Reflect, Serialize, Deserialize)]
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#[reflect(Serialize, Deserialize, Clone, PartialEq, Hash, Default)]
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pub enum LineBreak {
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/// Uses the [Unicode Line Breaking Algorithm](https://www.unicode.org/reports/tr14/).
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/// Lines will be broken up at the nearest suitable word boundary, usually a space.
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/// This behavior suits most cases, as it keeps words intact across linebreaks.
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#[default]
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WordBoundary,
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/// Lines will be broken without discrimination on any character that would leave bounds.
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/// This is closer to the behavior one might expect from text in a terminal.
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/// However it may lead to words being broken up across linebreaks.
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AnyCharacter,
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/// Wraps at the word level, or fallback to character level if a word can’t fit on a line by itself
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WordOrCharacter,
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/// No soft wrapping, where text is automatically broken up into separate lines when it overflows a boundary, will ever occur.
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/// Hard wrapping, where text contains an explicit linebreak such as the escape sequence `\n`, is still enabled.
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NoWrap,
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}
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/// Determines which antialiasing method to use when rendering text. By default, text is
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/// rendered with grayscale antialiasing, but this can be changed to achieve a pixelated look.
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///
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/// **Note:** Subpixel antialiasing is not currently supported.
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default, Reflect, Serialize, Deserialize)]
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#[reflect(Serialize, Deserialize, Clone, PartialEq, Hash, Default)]
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#[doc(alias = "antialiasing")]
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#[doc(alias = "pixelated")]
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pub enum FontSmoothing {
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/// No antialiasing. Useful for when you want to render text with a pixel art aesthetic.
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///
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/// Combine this with `UiAntiAlias::Off` and `Msaa::Off` on your 2D camera for a fully pixelated look.
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///
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/// **Note:** Due to limitations of the underlying text rendering library,
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/// this may require specially-crafted pixel fonts to look good, especially at small sizes.
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None,
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/// The default grayscale antialiasing. Produces text that looks smooth,
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/// even at small font sizes and low resolutions with modern vector fonts.
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#[default]
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AntiAliased,
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||
// TODO: Add subpixel antialias support
|
||
// SubpixelAntiAliased,
|
||
}
|
||
|
||
/// System that detects changes to text blocks and sets `ComputedTextBlock::should_rerender`.
|
||
///
|
||
/// Generic over the root text component and text span component. For example, [`Text2d`](crate::Text2d)/[`TextSpan`] for
|
||
/// 2d or `Text`/[`TextSpan`] for UI.
|
||
pub fn detect_text_needs_rerender<Root: Component>(
|
||
changed_roots: Query<
|
||
Entity,
|
||
(
|
||
Or<(
|
||
Changed<Root>,
|
||
Changed<TextFont>,
|
||
Changed<TextLayout>,
|
||
Changed<Children>,
|
||
)>,
|
||
With<Root>,
|
||
With<TextFont>,
|
||
With<TextLayout>,
|
||
),
|
||
>,
|
||
changed_spans: Query<
|
||
(Entity, Option<&ChildOf>, Has<TextLayout>),
|
||
(
|
||
Or<(
|
||
Changed<TextSpan>,
|
||
Changed<TextFont>,
|
||
Changed<Children>,
|
||
Changed<ChildOf>, // Included to detect broken text block hierarchies.
|
||
Added<TextLayout>,
|
||
)>,
|
||
With<TextSpan>,
|
||
With<TextFont>,
|
||
),
|
||
>,
|
||
mut computed: Query<(
|
||
Option<&ChildOf>,
|
||
Option<&mut ComputedTextBlock>,
|
||
Has<TextSpan>,
|
||
)>,
|
||
) {
|
||
// Root entity:
|
||
// - Root component changed.
|
||
// - TextFont on root changed.
|
||
// - TextLayout changed.
|
||
// - Root children changed (can include additions and removals).
|
||
for root in changed_roots.iter() {
|
||
let Ok((_, Some(mut computed), _)) = computed.get_mut(root) else {
|
||
once!(warn!("found entity {} with a root text component ({}) but no ComputedTextBlock; this warning only \
|
||
prints once", root, core::any::type_name::<Root>()));
|
||
continue;
|
||
};
|
||
computed.needs_rerender = true;
|
||
}
|
||
|
||
// Span entity:
|
||
// - Span component changed.
|
||
// - Span TextFont changed.
|
||
// - Span children changed (can include additions and removals).
|
||
for (entity, maybe_span_child_of, has_text_block) in changed_spans.iter() {
|
||
if has_text_block {
|
||
once!(warn!("found entity {} with a TextSpan that has a TextLayout, which should only be on root \
|
||
text entities (that have {}); this warning only prints once",
|
||
entity, core::any::type_name::<Root>()));
|
||
}
|
||
|
||
let Some(span_child_of) = maybe_span_child_of else {
|
||
once!(warn!(
|
||
"found entity {} with a TextSpan that has no parent; it should have an ancestor \
|
||
with a root text component ({}); this warning only prints once",
|
||
entity,
|
||
core::any::type_name::<Root>()
|
||
));
|
||
continue;
|
||
};
|
||
let mut parent: Entity = span_child_of.parent();
|
||
|
||
// Search for the nearest ancestor with ComputedTextBlock.
|
||
// Note: We assume the perf cost from duplicate visits in the case that multiple spans in a block are visited
|
||
// is outweighed by the expense of tracking visited spans.
|
||
loop {
|
||
let Ok((maybe_child_of, maybe_computed, has_span)) = computed.get_mut(parent) else {
|
||
once!(warn!("found entity {} with a TextSpan that is part of a broken hierarchy with a ChildOf \
|
||
component that points at non-existent entity {}; this warning only prints once",
|
||
entity, parent));
|
||
break;
|
||
};
|
||
if let Some(mut computed) = maybe_computed {
|
||
computed.needs_rerender = true;
|
||
break;
|
||
}
|
||
if !has_span {
|
||
once!(warn!("found entity {} with a TextSpan that has an ancestor ({}) that does not have a text \
|
||
span component or a ComputedTextBlock component; this warning only prints once",
|
||
entity, parent));
|
||
break;
|
||
}
|
||
let Some(next_child_of) = maybe_child_of else {
|
||
once!(warn!(
|
||
"found entity {} with a TextSpan that has no ancestor with the root text \
|
||
component ({}); this warning only prints once",
|
||
entity,
|
||
core::any::type_name::<Root>()
|
||
));
|
||
break;
|
||
};
|
||
parent = next_child_of.parent();
|
||
}
|
||
}
|
||
}
|